Flux Control; Brake Chopper - ABB ACS800 Series Firmware Manual

90
No. Name/Value

26 FLUX CONTROL

26.01 FLUX OPTIMIZATION
NO
YES
26.02 FLUX BRAKING
NO
YES
26.06 FLUX REF/MAX
0.0...100.0%
26.07 ACTIVE FLUX CTRL
NO
YES
26.08 FLUX REF 2
30.0...100.0%
26.09 FLUX MIN
0.0...100.0%
26.10 FLUX RAMP RATE
0.0...100.0 s

27 BRAKE CHOPPER

27.01 BRAKE CHOPPER CTL
OFF
ON
27.02 BR OVERLOAD FUNC
NO
WARNING
FAULT
27.03 BR RESISTANCE
0.01...100.00 Ohm
27.04 BR THERM TCONST
0.001...10000.000 s
Actual signals and parameters
Description
Flux control variables. Improves the stability of a system by
decreasing the amount of electrical motor flux when low torque
requirements are present.
Activates/deactivates the flux optimization function. See
Optimization on page 35.
Inactive.
Active.
Activates/deactivates the flux braking function. See
page 34.
Inactive.
Active.
Maximum flux reference. Used if
if the required motor torque is > 30%.
Setting range.
Activates/deactivates the active flux control.
Motor flux percentage equals
Motor flux percentage comes from the active program control.
Motor flux percentage active while no run signal is present or when the
required motor torque is >10% and <30%.
Setting range.
Motor flux percentage active while required motor torque is <10%.
Setting range.
The time it takes for the flux to ramp from
FLUX REF/MAX when 26.07
Setting range.
Control of the brake chopper.
Activates the brake chopper control.
Note: If an external chopper (e.g. NBRA-xxx) is used, parameter must
be disabled.
Inactive.
Active.
Note: Ensure the brake chopper and resistor are installed and the
overvoltage control is switched off
Activates the overload protection of the brake resistor. The user-
adjustable variables are 27.03
TCONST and 27.05 MAX CONT BR POWER.
Inactive.
Active. If the drive detects an overload, it generates a warning.
Active. If the drive detects an overload, it trips on a fault.
Defines the resistance value of the brake resistor. The value is used in
the overload protection. See
Resistance value.
Defines the thermal time constant of the brake resistor. The value is
used in the overload protection. See
Time Constant.
Flux Braking
26.07 ACTIVE FLUX CTRL is NO or
26.06 FLUX REF/MAX.
26.09 FLUX MIN to
ACTIVE FLUX CTRL is set to YES.
(20.05 OVERVOLTAGE CTRL).
BR RESISTANCE, 27.04
27.02 BR OVERLOAD FUNC.
27.02 BR OVERLOAD FUNC.
FbEq
Flux
0
65535
on
0
65535
10 = 1%
0
66535
10 = 1%
10 = 1%
26.06
10 = 1 s
0
65536
BR THERM
0
1
2
1 = 1 Ohm
1 = 1 s